S
M
T
W
T
F
S
29
55°
36°
30
58°
44°
1
57°
40°
2
54°
37°
3
59°
40°
4
62°
41°
5
56°
36°
6
51°
37°
7
51°
42°
8
58°
42°
9
61°
40°
10
60°
43°
11
59°
41°
12
58°
37°
13
49°
31°
14
49°
28°
15
47°
30°
16
46°
27°
17
47°
31°
18
50°
41°
19
61°
42°
20
60°
39°
21
51°
33°
22
49°
30°
23
55°
40°
24
57°
39°
25
47°
29°
26
48°
28°
27
49°
34°
28
50°
31°
29
53°
29°
30
49°
30°
31
50°
29°
1
49°
27°
2
50°
29°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Irwin
Irwin's December 2026 forecast shows daily high temperatures ranging from 46° to 62°, with overnight lows between 27° and 44°. The average high for December is 53° with an average low of 35°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Irwin. See also: January | February | March.
